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A rational approach to model the behavior of bonded soils

Evangelista, A and Picarelli, L (1998) A rational approach to model the behavior of bonded soils. In: 2nd International Symposium on Hard Soils - Soft Rocks, Oct 12-14, 1998, Naples, Italy.

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Abstract

The paper presents a rational approach to model the behavior of bonded soils within the frame work of hardening plasticity. The approach is based on the premise that the resistance of bonded materials is a superposition of the two components of cement bond strength and soil frictional strength and that the deformation of the soil is associated with the frictional component of stresses just as in the case of a remoulded soil, the bonds offering additional resistance at any given strain level. This concept is similar to two stiffnesses acting in parallel for the same strain response. The proposed model considers the constitutive laws separately for the two components (bond and frictional) and adds the two to get the overall response. The unbonded soil component is described by the well known 'modified Cam clay' model. The response of the bond component is also described by a strain softening elasto-plastic model, considering the behavior to be elastic up to the yield surface and elasto-plastic beyond yield surface. To illustrate the capability of the proposed, model some laboratory test results of both compression and-extension shear tests are predicted. Despite the model being simple, several typical features of the behavior of bonded materials are well reproduced. The model parameters are well defined and easily determinable.

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to A A Balkema.
Department/Centre: Others
Date Deposited: 15 Mar 2012 08:58
Last Modified: 15 Mar 2012 08:58
URI: http://eprints.iisc.ernet.in/id/eprint/43975

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